1. The problem statement, all variables and given/known data In a large water tank experiment, water waves are generated with straight, parallel wave fronts, 3.00 m apart. The wave fronts pass through two openings 5.00 m apart in a long board. The end of the tank is 3.00 m beyond the board. Where would you stand, relative to the perpendicular bisector of the line between the openings, if you want to receive little or no wave action? 2. Relevant equations Xn/L = (n-0.5)wavelength/d n is the number of the nodal line, xn is the distance from the bisector to the point on the nodal line, d is the distance between both sources and L is the distance from the midpoint of both sources to the point on the nodal line. 3. The attempt at a solution For little to no wave action I know the person has to be standing on a nodal line, and the distance from the right bisector to that point would be Xn. What I've gathered from the question is that the wave length is 3m, d=5m, and L = 3m, and I think n is 1. However, when I use these numbers i get an answer of 0.9m, when the answer in the back of the book is 1.25m. This is the answer in the solution manual and I have no clue how they got the wavelength to be 1m, the d to be 2m and the L to be 5m. Help is appreciated.